Malco SL-1 Snap Lock Punch Soft touch, non slip handle insert Unique one-hand operation latch Ergonomically contoured handles Punches raise a louvered shaped projection on metal edge for locking into rolled edge of sheet or piece to be joined Punch impression spaced 3/8-Inch from edge of metal, pieces snap together. Compound handle leverage for maximum ease of operation, heavy forged cutting jaw. Rust resistant nickel plate and black oxide finish Features vinyl grips with hand stops for added comfort and Resistance to elements